WindowView — Science

Perspectives

(092112)

Dr. Paul Sereno

Interesting Comments On Dinosaur Evolution

One of
the lunch hour symposia at the February 2002 annual meeting for
the American Association for the Advancement of Science (AAAS)
offered an interesting comment with regard to dinosaur evolution.
The big story that captivated the audience was in regard to recent
dinosaurs fossil finds in Africa. Remarkable finds have come out
of the work of Dr. Paul Sereno and
his graduate students at the University of
Chicago. He notes that until recently Africa was relatively
silent on such fossil information. Even the mammalian fossil record
is near nonexistent simply because the continent remains unexplored.

Two of the many comments
that seemed to stand out like neon signs are: 1) dinosaurs appear to repeatedly lose digits
(e.g., like disappearing fingers) progressively in the fossil record, and 2) even those dinosaurs that obviously lived
by and hunted in water never show adaptations to being in water.

But why?

Isn't evolution driven by randomness and adaptations that offer advantages
to survival. If in water, then why not adaptations to take advantage of the
water niche. This is noteworthy in light of other observations we see in the
Science Area of WindowView, especially with regard to a possible nonrandom
mechanism for evolution.

Perhaps some evolution is driven by environment,
but so too, there may be an information base (like an endowment from a prior
historical start point) within a species to represent the potential of all
adaptational changes that the species can express. All future changes are
based only on this information. All other mutations cause loss.

Could it be
that dinosaurs were simply not provided that potential and not the information
base so we see only a loss of digits over time, never new ones arising...
and life in water, but no adaptations in form, skeleton, or otherwise to indicate
evolution in the classical sense. The observations here seem to echo Dr. Spetner's
comments that mutations cause only the loss of information. Is the loss of
digits a result of what mutations can do?

Dr. Sereno also made another comment on finding a rather large
dinosaur skeleton with feathers. The implication is that dinosaurs
are predecessors to birds. But the creature as depicted at the
symposium was much larger than is reasonable for a flying animal.
The suggestion was that feathers afforded shade or cooling, but
not flight. What is not mentioned is that feathers appear fully
formed in the fossil record. No intermediate forms—from primitive
to complex feather morphology—have been discovered.

Dr. Sereno offered yet another example of a feature that is
a long way from a connection to flight or from dinosaurs to birds.
There may be several reasons for this, but for now we'll simply
say several interesting and wonderful new fossil specimens now
reside in museums.

(090103)

Director's Note (2013): More recent publications describing feather like appendages on certain dinosaur fossils have been reinterpreted, upon closer and added observations, to be quill or hair like features that are not considered feathers. The intension is to add more information on these recent publications here as revisions and updates are available.

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